# Shared Flashcard Set

## Details

Lecture 6
Waves
26
Physics
07/09/2011

Term
 what is a wave
Definition
 a transfer of momentum and energy
Term
 how do mechanical waves
Definition
 mechanical waves obey classical physics, and require a medium through which to travel
Term
 what is a nondispersive wave
Definition
 this is an example of a perfectly elastic wave that is momentarily displaced by a wave and then returned to its original position
Term
 a mechanical wave has two subunits, what are they
Definition
 transverse waves-like waves on a string & longitudinal wave- like sound waves
Term
 both transverse and longitudinal can be represented mathematically, how
Definition
 for a transverse wave, the sine function represents vertical displacement of the medium vs. time   for a longitudinal wave, the sine represents pressue or horizontal displacement vs. time
Term
 what is frequency measured in
Definition
 Hertz
Term
 what is product of frequency and wavelength
Definition
 velocity
Term
 is amplitude always positive
Definition
 yes its always positive
Term
 do sound waves made by a speeding jet travel at the same speed as the sound waves made by a crawling turtle? what can this tell us about the velocity of waves
Definition
 yes the sound waves from the speeding jet and the crawling turtle will be the same, this tells us that velocity of waves is not affect by the frequency or the wavelength but the medium itself
Term
 what are two aspects that can affect the velocity of a wave
Definition
 the elasticity or the medium and the medium's resistance to chnage motion
Term
 how do heavier mediums affect the velocity of the wave
Definition
 slow it down
Term
 the velocity of waves in the gas phase can be increased by
Definition
 increasing the temperature
Term
 in gravity waves, like the waves in water, what increases their velocity
Definition
 the depth of the water
Term
 what is the unit scale of decibels for
Definition
 measure the intensity of sounds
Term
 if the intensity of a sound increase by a factor of 10, the decibels
Definition
 increase by the addition of 10 decibels
Term
 how does the phase of a wave relate to a nondispersive medium
Definition
 it is constant
Term
 what is a phase
Definition
 two waves that are the same wavelength but travel different distances to arrive at the same point
Term
 how do constructive and destructive interference relate to displacement
Definition
 constructive will add to the overall displacement while destructive will subtract from the overall displacement
Term
 pitch corresponds to frequency, a high note has higher frequency and
Definition
 high pitch
Term
 when two waves are superimposeed, the resulting wave can be found by summing their what
Definition
 displacements
Term
 in order for two sound waves to have an audible beat frequency, the two waves must be
Definition
 relatively close in frequency
Term
 an important property of simple harmonic motion is the acceleration is directly proportional to
Definition
 displacement
Term
 an important characteristic of simple harmonic motion is the oscillation between kinetic and potential energy, what  does this tell us about oscillation
Definition
 that no energy is lost to its surroundings
Term
 how would you describe a pendulum swinging
Definition
 simple harmonic motion
Term
 give three examples of simple harmonic motion
Definition
 orbit of a planet (looking at it from the side), tether ball (looking at it from the side), & oscillating electrons
Supporting users have an ad free experience!